THE WOODLANDS, Texas--(BUSINESS WIRE)--Pernix Therapeutics Holdings, Inc. (“Pernix” or the “Company”) (NYSE MKT: PTX), a specialty pharmaceutical company, today announced that it has entered into a definitive agreement to acquire Great Southern Laboratories, a privately-held pharmaceutical contract manufacturing company located in Houston, Texas. Under the terms of the agreement, Pernix will pay $4.9 million to acquire substantially all of the assets of Great Southern Laboratories and assume certain liabilities. The assets include buildings and land located in Houston. Pernix anticipates completing this transaction in July 2012.